Melt the butter in a small pot. Add the sugar, syrup, and water. Attach thermometer and cook the mixture to 300 degrees. Stir in the coarsely chopped almonds.
While the above is cooking to 300 degrees, grease a baking sheet with butter or spray, line with parchment and grease the parchment. Set aside.
After the nuts have been added to the sugar mixture, quickly pour the mixture onto the prepared pan. Spread it slightly and let cool.
While the above is cooling, melt the chocolate in a bain-marie (double boiler). Once brittle is cool, pour chocolate and spread evenly over brittle. Last, add nuts. Once chocolate has set, break into pieces and serve.